/* ==========================================================================
   湖南德尚源耐磨工业有限公司 — 官网样式
   设计基准：SMS group 站点实测 token（工业蓝主导、极小圆角、描边无阴影卡片）
   品牌红仅用于 logo / CTA / 关键数字
   ========================================================================== */

:root {
  /* 主色 */
  --blue: #0075bd;
  --blue-dark: #005486;
  --blue-deep: #0b3966;
  --blue-light: #e6f2f9;
  --cyan: #00c2ff;

  /* 品牌红（强调色，克制使用） */
  --red: #ee2400;
  --red-dark: #c51d00;

  /* 灰阶 */
  --g50: #f2f5f9;
  --g100: #e8ebef;
  --g200: #d4d8dd;
  --g300: #b3b9c0;
  --g400: #9fa3ad;
  --g500: #82838b;
  --g600: #595a66;
  --g700: #454654;
  --g800: #303140;
  --g900: #22202e;
  --white: #fff;

  --font: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    sans-serif;

  --radius: 4px;
  --wrap: 1280px;
  --nav-h: 72px;
  --bar-h: 36px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + var(--bar-h)); }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--g800);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; transition: color 0.2s var(--ease); }
a:hover { color: var(--blue-dark); }
ul { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
  color: var(--g900);
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4.4vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.4rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* ---------- layout ---------- */
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 32px; }

.section { padding: 88px 0; }
.section--tint { background: var(--g50); }
.section--blue { background: var(--blue-deep); color: rgba(255, 255, 255, 0.88); }
.section--blue h2,
.section--blue h3 { color: var(--white); }

.section-head { max-width: 780px; margin-bottom: 48px; }
.section-head p { color: var(--g600); font-size: 1.05rem; margin: 16px 0 0; }
.section--blue .section-head p { color: rgba(255, 255, 255, 0.75); }

/* 小标签：蓝色竖线 + 大写字距 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--red);
}
.section--blue .eyebrow { color: var(--cyan); }

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 48px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.btn--primary { background: var(--red); color: var(--white); }
.btn--primary:hover { background: var(--red-dark); color: var(--white); }

.btn--blue { background: var(--blue); color: var(--white); }
.btn--blue:hover { background: var(--blue-dark); color: var(--white); }

.btn--ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.55);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  border-color: var(--white);
}

.btn--line { background: var(--white); color: var(--g800); border-color: var(--g200); }
.btn--line:hover { border-color: var(--blue); color: var(--blue); }

.btn--sm { height: 40px; padding: 0 18px; font-size: 0.875rem; }

/* 文字箭头链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.925rem;
}
.link-arrow::after {
  content: "→";
  transition: transform 0.2s var(--ease);
}
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--white);
  border-bottom: 1px solid var(--g100);
}

/* 顶部细条：语言 + 电话 */
.meta-bar {
  height: var(--bar-h);
  background: var(--blue-deep);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.8rem;
}
.meta-bar .wrap {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 24px;
  height: 100%;
}
.meta-bar a { color: rgba(255, 255, 255, 0.8); }
.meta-bar a:hover { color: var(--white); }
.meta-bar strong { color: var(--white); font-weight: 700; }

.lang-switch { display: flex; align-items: center; gap: 2px; }
.lang-switch button {
  background: none;
  border: 0;
  padding: 2px 8px;
  font: inherit;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  border-radius: 2px;
}
.lang-switch button[aria-pressed="true"] { color: var(--white); background: rgba(255, 255, 255, 0.16); }
.lang-switch span { color: rgba(255, 255, 255, 0.3); }

.nav-bar .wrap {
  display: flex;
  align-items: center;
  gap: 40px;
  height: var(--nav-h);
}

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand img { width: 42px; height: 42px; border-radius: 2px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-cn { font-size: 1.0rem; font-weight: 700; color: var(--g900); letter-spacing: 0.02em; }
.brand-en {
  font-size: 0.6rem;
  color: var(--g500);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.main-nav { margin-left: auto; }
/* 只作用于顶级 ul，不要连带把 .nav-drop 这个嵌套 ul 也横排 */
.main-nav > ul { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  display: block;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--g700);
  border-bottom: 2px solid transparent;
}
.main-nav a:hover { color: var(--blue); }
.main-nav a[aria-current="page"] {
  color: var(--blue);
  font-weight: 700;
  border-bottom-color: var(--blue);
}

.nav-cta { flex-shrink: 0; }

/* ---------- 导航下拉：产品 ▾ ---------- */
.nav-item--drop { position: relative; }

/* 产品后面的小箭头，用伪元素避免影响中英文块计数 */
.nav-item--drop > a::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform 0.2s var(--ease);
}
.nav-item--drop:hover > a::after,
.nav-item--drop:focus-within > a::after {
  transform: translateY(0) rotate(225deg);
}

/* li 底边到导航条底边有约 13px 空隙，用伪元素桥接，
   否则鼠标从「产品」下移到菜单的途中会脱离 hover、菜单闪退 */
.nav-item--drop::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 14px;
}

.nav-drop {
  display: block;
  position: absolute;
  top: calc(100% + 13px);
  left: 0;
  z-index: 70;
  min-width: 248px;
  padding: 6px 0;
  background: var(--white);
  border: 1px solid var(--g100);
  border-top: 2px solid var(--blue);
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: 0 12px 28px rgba(11, 57, 102, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease),
    visibility 0.18s var(--ease);
}
/* focus-within 从可见的父链接起链：先聚焦「产品」→ 菜单显现 → 子项才可 Tab 进入 */
.nav-item--drop:hover .nav-drop,
.nav-item--drop:focus-within .nav-drop {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.nav-drop li { display: block; }
.nav-drop a {
  display: block;
  padding: 9px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--g700);
  white-space: nowrap;
  border-bottom: 0;
  border-left: 2px solid transparent;
}
.nav-drop a:hover {
  background: var(--g50);
  color: var(--blue);
  border-left-color: var(--blue);
}
/* 下拉里的当前页用底色标记，不用下划线（下划线在菜单里认不出来） */
.nav-drop a[aria-current="page"] {
  background: var(--blue-light);
  color: var(--blue-dark);
  font-weight: 700;
  border-left-color: var(--blue);
}
/* 「产品总览」与单品之间加一道分隔 */
.nav-drop__sep { margin: 6px 0; border-top: 1px solid var(--g100); }

/* 停留在产品域的任意子页时，父项「产品」保持高亮 */
.main-nav a.is-section {
  color: var(--blue);
  font-weight: 700;
  border-bottom-color: var(--blue);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--g200);
  border-radius: var(--radius);
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  position: absolute;
  left: 12px;
  width: 18px;
  height: 2px;
  background: var(--g800);
  content: "";
  transition: transform 0.2s var(--ease);
}
.nav-toggle span { top: 21px; }
.nav-toggle span::before { top: -6px; left: 0; }
.nav-toggle span::after { top: 6px; left: 0; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(118deg, #0b3966 0%, #0b3966 38%, #0075bd 100%);
  color: var(--white);
}
.hero::after {
  /* 高炉厂区剪影压在底部，作为纹理而非主体 */
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(1080px, 82%);
  aspect-ratio: 1080 / 377;
  background: url("../img/hero-plant-silhouette.png") right bottom / contain no-repeat;
  opacity: 0.13;
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 780px;
  padding: 116px 0 124px;
}
.hero h1 { color: var(--white); }
.hero__sub {
  margin: 22px 0 0;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.82);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.hero .eyebrow { color: var(--cyan); }

/* 子页头部（比首页 hero 矮） */
.page-hero {
  background: linear-gradient(118deg, #0b3966 0%, #0b3966 45%, #0075bd 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(760px, 60%);
  aspect-ratio: 1080 / 377;
  background: url("../img/hero-plant-silhouette.png") right bottom / contain no-repeat;
  opacity: 0.1;
}
.page-hero__inner { position: relative; z-index: 2; max-width: 820px; padding: 64px 0 68px; }
.page-hero h1 { color: var(--white); font-size: clamp(1.8rem, 3.4vw, 2.7rem); }
.page-hero p {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.05rem;
}

/* 面包屑 */
.crumb { font-size: 0.85rem; color: rgba(255, 255, 255, 0.6); margin-bottom: 14px; }
.crumb a { color: rgba(255, 255, 255, 0.75); }
.crumb a:hover { color: var(--white); }

/* ---------- 数字条 ---------- */
.stat-strip { background: var(--white); border-bottom: 1px solid var(--g100); }
.stat-strip ul {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}
.stat-strip li {
  padding: 30px 20px;
  text-align: center;
  border-left: 1px solid var(--g100);
}
.stat-strip li:first-child { border-left: 0; }
.stat-strip b {
  display: block;
  font-size: clamp(1.35rem, 2.1vw, 1.95rem);
  font-weight: 700;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
/* 数字不再用红色强调，统一深蓝 */
.stat-strip b em { font-style: normal; color: inherit; }
.stat-strip small {
  display: block;
  margin-top: 4px;
  font-size: 0.825rem;
  color: var(--g500);
}

/* ---------- cards ---------- */
.card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.card:hover { border-color: var(--blue); transform: translateY(-2px); }

.card__media {
  aspect-ratio: 16 / 10;
  background: var(--g50);
  overflow: hidden;
}
.card__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10px;
  transition: transform 0.35s var(--ease);
}
.card__media--cover img { object-fit: cover; padding: 0; }
.card:hover .card__media img { transform: scale(1.03); }

.card__body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.card__body h3 { font-size: 1.1rem; }
.card__body p {
  margin: 10px 0 16px;
  font-size: 0.925rem;
  color: var(--g600);
  line-height: 1.65;
}
.card__body .link-arrow { margin-top: auto; }

/* 卡片里的关键指标行 */
.spec-list { margin: 0 0 18px; font-size: 0.875rem; }
.spec-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--g100);
}
.spec-list li:last-child { border-bottom: 0; }
.spec-list span { color: var(--g500); }
.spec-list b { color: var(--blue-deep); font-weight: 700; text-align: right; }
.spec-list b.hl { color: var(--blue); }

/* 技术支柱卡（无图，编号大字） */
.pillar {
  padding: 30px 28px;
  background: var(--white);
  border: 1px solid var(--g100);
  border-top: 3px solid var(--blue);
  border-radius: var(--radius);
}
.pillar__no {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--g300);
  margin-bottom: 12px;
}
.pillar h3 { font-size: 1.15rem; margin-bottom: 12px; }
.pillar p { font-size: 0.925rem; color: var(--g600); margin: 0 0 14px; }
.pillar__metric {
  display: inline-block;
  padding: 5px 12px;
  background: var(--blue-light);
  color: var(--blue-dark);
  border-radius: 2px;
  font-size: 0.85rem;
  font-weight: 700;
}

/* 案例卡：前后对比 */
.case {
  padding: 30px 28px;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
}
.case__client {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 10px;
}
.case h3 { font-size: 1.15rem; }
.case p { font-size: 0.925rem; color: var(--g600); margin: 12px 0 20px; }
.compare {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--g100);
}
.compare__col small {
  display: block;
  font-size: 0.75rem;
  color: var(--g500);
  margin-bottom: 2px;
}
.compare__col b { font-size: 1.35rem; font-weight: 700; color: var(--g400); }
.compare__col--after b { color: var(--blue); }
.compare__arrow { color: var(--g300); font-size: 1.1rem; }

/* ---------- 图文分栏 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split--narrow-media { grid-template-columns: 1.15fr 0.85fr; }
.split__media img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--g100);
}
/* 竖幅照片（如在炉实拍）不能撑爆分栏高度 */
.split__media--tall img {
  max-height: 560px;
  width: auto;
  max-width: 100%;
  margin: 0 auto;
}
.split__media figcaption {
  margin-top: 10px;
  font-size: 0.825rem;
  color: var(--g500);
  text-align: center;
}
.split p { color: var(--g600); }

/* 小图廊：产品细节配图 */
.gallery { display: grid; gap: 20px; margin-top: 40px; }
.gallery--2 { grid-template-columns: repeat(2, 1fr); }
.gallery--3 { grid-template-columns: repeat(3, 1fr); }
.gallery figure { margin: 0; }
.gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
  padding: 8px;
}
.gallery img.cover { object-fit: cover; padding: 0; }
.gallery figcaption {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--g500);
  text-align: center;
}
@media (max-width: 720px) {
  .gallery--2, .gallery--3 { grid-template-columns: 1fr; }
}

/* 资质标签墙 */
.tag-wall { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.tag {
  padding: 7px 14px;
  background: var(--g50);
  border: 1px solid var(--g100);
  border-radius: 2px;
  font-size: 0.85rem;
  color: var(--g700);
}
.tag--blue { background: var(--blue-light); border-color: #cfe6f3; color: var(--blue-dark); font-weight: 700; }

/* 客户名单条 */
.client-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 48px;
  border: 1px solid var(--g100);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}
.client-strip li {
  flex: 1 1 16.66%;
  min-width: 130px;
  padding: 18px 12px;
  text-align: center;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--g700);
  border-right: 1px solid var(--g100);
  border-bottom: 1px solid var(--g100);
}

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--g100); border-radius: var(--radius); }
table.data {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--white);
}
table.data caption {
  padding: 16px 20px;
  text-align: left;
  font-weight: 700;
  color: var(--g900);
  background: var(--g50);
  border-bottom: 1px solid var(--g100);
}
table.data th,
table.data td { padding: 13px 20px; text-align: left; border-bottom: 1px solid var(--g100); }
table.data thead th {
  background: var(--blue-deep);
  color: var(--white);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
table.data tbody tr:hover { background: var(--g50); }
table.data td.num { font-variant-numeric: tabular-nums; }
table.data td.hl { color: var(--blue-deep); font-weight: 700; }
table.data tbody tr:last-child td { border-bottom: 0; }

/* 时间轴（溜槽 5 代演进） */
.timeline { position: relative; padding-left: 0; }
.timeline li {
  position: relative;
  padding: 0 0 32px 32px;
  border-left: 2px solid var(--g100);
}
.timeline li:last-child { padding-bottom: 0; border-left-color: transparent; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--blue);
}
.timeline li.is-current::before { border-color: var(--blue-deep); background: var(--blue-deep); }
.timeline h4 { font-size: 1.05rem; margin-bottom: 6px; }
.timeline small {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue);
  margin-bottom: 4px;
}
.timeline p { font-size: 0.925rem; color: var(--g600); margin: 0; }

/* ---------- 联系区 + 表单 ---------- */
.contact { background: var(--blue-deep); color: rgba(255, 255, 255, 0.85); }
.contact__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: start;
}
.contact h2 { color: var(--white); }
.contact__lead { color: rgba(255, 255, 255, 0.78); margin: 16px 0 32px; }

.contact-list { margin: 0; }
.contact-list > div {
  display: flex;
  gap: 16px;
  padding: 15px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}
.contact-list > div:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.14); }
.contact-list dt {
  flex: 0 0 82px;
  font-size: 0.825rem;
  color: rgba(255, 255, 255, 0.55);
}
.contact-list dd { margin: 0; font-weight: 500; color: var(--white); }
.contact-list dd a { color: var(--white); }
.contact-list dd a:hover { color: var(--cyan); }
.contact-list dd small {
  display: block;
  font-weight: 400;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
}

.form-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px;
  color: var(--g800);
}
.form-card h3 { font-size: 1.25rem; margin-bottom: 6px; }
.form-card > p { font-size: 0.9rem; color: var(--g500); margin-bottom: 26px; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 0.85rem; font-weight: 700; color: var(--g700); }
.field label .req { color: var(--g600); }
.field input,
.field select,
.field textarea {
  height: 46px;
  padding: 0 14px;
  border: 1px solid var(--g200);
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.925rem;
  color: var(--g900);
  background: var(--white);
  transition: border-color 0.2s var(--ease);
}
.field textarea { height: auto; padding: 12px 14px; resize: vertical; min-height: 104px; }
.field input:focus,
.field select:focus,
.field textarea:focus { border-color: var(--blue); outline: none; }
.field input:invalid:not(:placeholder-shown) { border-color: var(--red); }

.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 26px;
  flex-wrap: wrap;
}
.form-foot small { font-size: 0.8rem; color: var(--g500); max-width: 60%; }
.form-note {
  margin-top: 16px;
  padding: 12px 14px;
  background: var(--blue-light);
  border-left: 3px solid var(--blue);
  border-radius: 2px;
  font-size: 0.85rem;
  color: var(--blue-dark);
  display: none;
}
.form-note.is-visible { display: block; }

/* ---------- 右侧悬浮 ---------- */
.side-links {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 55;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius) 0 0 var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(11, 57, 102, 0.18);
}
.side-links a,
.side-links button {
  position: relative;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue);
  color: var(--white);
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  cursor: pointer;
  font-size: 1.05rem;
  transition: background 0.2s var(--ease);
}
.side-links a:last-child,
.side-links button:last-child { border-bottom: 0; }
.side-links a:hover,
.side-links button:hover { background: var(--red); color: var(--white); }
.side-links .is-cta { background: var(--red); }
.side-links .is-cta:hover { background: var(--red-dark); }
/* hover 展开文字标签 */
.side-links .tip {
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  margin-right: 0;
  padding: 0 0;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  background: var(--g900);
  color: var(--white);
  font-size: 0.825rem;
  line-height: 32px;
  border-radius: 2px 0 0 2px;
  transition: max-width 0.25s var(--ease), padding 0.25s var(--ease);
}
.side-links a:hover .tip,
.side-links button:hover .tip { max-width: 260px; padding: 0 14px; }
.side-links .to-top { display: none; }
.side-links .to-top.is-visible { display: flex; }

/* ---------- footer ---------- */
.site-footer { background: var(--g900); color: rgba(255, 255, 255, 0.6); font-size: 0.9rem; }
.site-footer__main {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 40px;
  padding: 64px 0 48px;
}
.site-footer h4 {
  color: var(--white);
  font-size: 0.925rem;
  margin-bottom: 16px;
}
.site-footer li { padding: 5px 0; }
.site-footer a { color: rgba(255, 255, 255, 0.6); }
.site-footer a:hover { color: var(--white); }
.site-footer .brand-cn { color: var(--white); }
.site-footer .brand-en { color: rgba(255, 255, 255, 0.45); }
.footer-about { margin: 18px 0 0; line-height: 1.7; max-width: 34ch; }
.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.825rem;
  color: rgba(255, 255, 255, 0.45);
}

/* ==========================================================================
   产品详情页组件（2026-09 依据最新宣传册新增）
   ========================================================================== */

/* ---------- 关键指标带：对应宣传册「核心价值」那一折 ---------- */
.metric-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--g100);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
  overflow: hidden;
}
.metric-band > div {
  padding: 26px 24px;
  background: var(--white);
}
.metric-band dt {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 10px;
}
.metric-band dd { margin: 0; }
.metric-band b {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
}
.metric-band b em { font-style: normal; color: inherit; }
.metric-band small {
  display: block;
  margin-top: 8px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--g600);
}

/* ---------- 行业痛点清单：红色左边线，和技术方案形成对照 ---------- */
.painpoint {
  margin: 0;
  padding: 26px 28px;
  background: var(--white);
  border: 1px solid var(--g100);
  border-left: 3px solid var(--g300);
  border-radius: var(--radius);
}
.painpoint > b {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--g600);
  margin-bottom: 14px;
}
.painpoint li {
  position: relative;
  padding: 7px 0 7px 20px;
  font-size: 0.925rem;
  color: var(--g600);
  border-bottom: 1px dashed var(--g100);
}
.painpoint li:last-child { border-bottom: 0; }
.painpoint li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--g300);
}
.painpoint strong { color: var(--g800); font-weight: 700; }

/* ---------- 编号技术卡：宣传册里 1/2/3… 的核心技术条目 ---------- */
.tech-num {
  display: flex;
  gap: 22px;
  padding: 26px 28px;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease);
}
.tech-num:hover { border-color: var(--blue); }
.tech-num__i {
  flex: 0 0 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-light);
  color: var(--blue-dark);
  border-radius: 50%;
  font-size: 1.05rem;
  font-weight: 700;
}
.tech-num__b { flex: 1; min-width: 0; }
.tech-num h3 { font-size: 1.1rem; margin-bottom: 8px; }
.tech-num p {
  margin: 0;
  font-size: 0.925rem;
  line-height: 1.65;
  color: var(--g600);
}
.tech-num p + p { margin-top: 8px; }
.tech-num ul { margin: 10px 0 0; }
.tech-num ul li {
  position: relative;
  padding: 4px 0 4px 18px;
  font-size: 0.9rem;
  color: var(--g600);
}
.tech-num ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 8px;
  height: 1px;
  background: var(--blue);
}
.tech-num__k {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 11px;
  background: var(--blue-light);
  color: var(--blue-dark);
  border-radius: 2px;
  font-size: 0.825rem;
  font-weight: 700;
}
/* 保留结构上的区分（左边线），但不再用红色 */
.tech-num--red { border-left: 3px solid var(--blue-deep); }
.tech-num--red .tech-num__i { background: var(--blue-light); color: var(--blue-deep); }

/* ---------- 图解序列：吊盘展开 4 图、溜槽三代款式 ---------- */
.figure-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 0;
}
.figure-row figure { margin: 0; }
.figure-row img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
}
.figure-row img.contain { object-fit: contain; padding: 8px; }
.figure-row figcaption {
  margin-top: 10px;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--g600);
}
.figure-row figcaption b {
  display: block;
  color: var(--g900);
  font-size: 0.9rem;
  margin-bottom: 2px;
}

/* ---------- 双图对比：我司 36 个月 vs 外企 24 个月 ---------- */
.compare-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.compare-pair figure {
  margin: 0;
  padding: 16px;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
}
.compare-pair figure.is-ours { border-color: #cfe6f3; background: var(--blue-light); }
.compare-pair img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  background: var(--white);
  border-radius: 2px;
}
.compare-pair figcaption {
  margin-top: 12px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--g800);
  text-align: center;
}
.compare-pair .is-ours figcaption { color: var(--blue-dark); }
@media (max-width: 560px) {
  .compare-pair { grid-template-columns: 1fr; }
  .compare-pair img { aspect-ratio: 4 / 3; }
}

/* ---------- 结论条：一句话结果，放在图解或表格之后 ---------- */
.takeaway {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin: 28px 0 0;
  padding: 22px 26px;
  background: var(--blue-light);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
}
.takeaway__t {
  flex: 0 0 auto;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
}
.takeaway p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--blue-dark);
}
@media (max-width: 560px) {
  .takeaway { flex-direction: column; gap: 10px; }
}

/* ---------- 页内子导航：长详情页的小节跳转 ---------- */
.subnav {
  background: var(--white);
  border-bottom: 1px solid var(--g100);
  position: sticky;
  top: calc(var(--nav-h) + var(--bar-h));
  z-index: 50;
}
.subnav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 10px 0;
}
.subnav a {
  display: block;
  padding: 7px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--g600);
  border-radius: 2px;
}
.subnav a:hover { background: var(--g50); color: var(--blue); }
@media (max-width: 980px) {
  .subnav { position: static; }
  .subnav ul { overflow-x: auto; flex-wrap: nowrap; }
  .subnav a { white-space: nowrap; }
}

/* ---------- 下一个产品：详情页之间横向串联 ---------- */
.next-prod {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 28px 32px;
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: var(--radius);
}
.next-prod small {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--g500);
  margin-bottom: 4px;
}
.next-prod b { font-size: 1.15rem; color: var(--g900); }

/* ---------- 滚动淡入 ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 语言切换：默认显示中文 ----------
   用法：<span data-en><span class="cn">中文</span><span class="en">English</span></span>
   revert 会退回该标签的默认 display，所以块级、行内元素通用，无需额外类名。 */
[data-en] > .en { display: none; }
html[lang="en"] [data-en] > .cn { display: none; }
html[lang="en"] [data-en] > .en { display: revert; }

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .site-footer__main { grid-template-columns: 1fr 1fr 1fr; }
  .stat-strip ul { grid-template-columns: repeat(3, 1fr); }
  .stat-strip li:nth-child(4) { border-left: 0; }
}

@media (max-width: 980px) {
  .wrap { padding: 0 24px; }
  .section { padding: 64px 0; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .split, .split--narrow-media, .contact__grid { grid-template-columns: 1fr; gap: 36px; }
  .contact__grid { gap: 40px; }
  .nav-cta { display: none; }
  .main-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--white);
    border-bottom: 1px solid var(--g100);
    box-shadow: 0 8px 24px rgba(34, 32, 46, 0.08);
    display: none;
  }
  .main-nav.is-open { display: block; }
  .main-nav > ul { flex-direction: column; align-items: stretch; gap: 0; padding: 8px 24px 20px; }
  .main-nav a { padding: 14px 0; border-bottom: 1px solid var(--g100); }
  .main-nav a[aria-current="page"] { border-bottom-color: var(--blue); }

  /* 触屏没有 hover，下拉改为常显的缩进子列表 */
  .nav-item--drop::after { display: none; }
  .nav-item--drop > a::after { display: none; }
  .nav-drop {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    min-width: 0;
    padding: 0 0 0 16px;
    border: 0;
    border-left: 2px solid var(--g100);
    border-radius: 0;
    box-shadow: none;
    margin: 0 0 0 2px;
    transition: none;
  }
  .nav-drop a { padding: 12px 0; font-size: 0.875rem; border-left: 0; }
  .nav-drop a:hover { background: none; }
  .nav-drop a[aria-current="page"] { background: none; border-left: 0; }
  .nav-drop__sep { display: none; }
  .nav-toggle { display: block; }
  .nav-bar .wrap { position: relative; }
  .side-links { top: auto; bottom: 0; transform: none; flex-direction: row; border-radius: 0; right: 0; left: 0; }
  .side-links a, .side-links button { flex: 1; height: 54px; border-bottom: 0; border-right: 1px solid rgba(255, 255, 255, 0.16); }
  .side-links .tip { display: none; }
  body { padding-bottom: 54px; }
}

@media (max-width: 720px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .tech-num { flex-direction: column; gap: 14px; }
  .metric-band > div { padding: 22px 20px; }
  .stat-strip ul { grid-template-columns: repeat(2, 1fr); }
  .stat-strip li { border-left: 0; border-top: 1px solid var(--g100); }
  .stat-strip li:nth-child(-n+2) { border-top: 0; }
  .site-footer__main { grid-template-columns: 1fr 1fr; gap: 28px; }
  .hero__inner { padding: 76px 0 84px; }
  .client-strip li { flex-basis: 50%; }
  .meta-bar .wrap { justify-content: space-between; gap: 12px; }
  .meta-bar .tel-meta { display: none; }
  .form-card { padding: 26px 22px; }
  .form-foot small { max-width: 100%; }
}

@media print {
  .site-header, .side-links, .hero__actions, .nav-toggle, .subnav { display: none !important; }
  .section { padding: 24px 0; }
  body { color: #000; }
}